World Cleanup Day
World Cleanup Day is held on September 18. The third Saturday of September. This event in the second decade of the month September is annual. 
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World Cleanup Day is celebrated with litter cleanup and waste mapping activities spanning every time zone. Environmental cleanup events are held in nearly every country until concluding near the international date line in Hawaii and American Samoa.
Similar holidays and events, festivals and interesting facts
World Patient Safety Day on September 17
International Grenache Day on September 17 (Celebrated on the 3rd Friday in September);
International Guinep Day on September 17
International Country Music Day on September 17
World Educational Psychologist Day on September 17
World Kleefstra Syndrome Day on September 17
World Water Monitoring Day on September 18
International Read an eBook Day on September 18 (The first major celebration of International read an eBook day was in 2014, and was put together by a major eBook distributor OverDrive);
World Marrow Donor Day on September 18 (is celebrated globally on the third Saturday of September);
International Eat An Apple Day on September 18 (Third Saturday of Septembe);
World Bamboo Day on September 18
International Day of Equal Pay on September 18 (established by the UN General Assembly on November 15, 2019. Several countries, including Georgia and Ukraine, sponsored the resolution);
International Coastal Cleanup Day on September 18 (Held on the third weekend of September);
International Day of University Sport on September 20
National Canal Conservation Day in Thailand on September 20